CN102899457A - Method for preventing top lance of vacuum cycle degassing furnace from falling - Google Patents
Method for preventing top lance of vacuum cycle degassing furnace from falling Download PDFInfo
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- CN102899457A CN102899457A CN2012103612886A CN201210361288A CN102899457A CN 102899457 A CN102899457 A CN 102899457A CN 2012103612886 A CN2012103612886 A CN 2012103612886A CN 201210361288 A CN201210361288 A CN 201210361288A CN 102899457 A CN102899457 A CN 102899457A
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Abstract
The invention provides a method for preventing the top lance of a vacuum cycle degassing furnace from falling. The method is characterized in that a top lance anti-falling control program is added in a main control PLC (Programmable Logic Controller); a weight sensor is mounted on a top lance transmission and connected with the main control PLC through a weight transmitter; the weight sensor sends the detected stress signal of a lower chain wheel to the weight transmitter; the weight transmitter converts a millivolt direct-current signal into an actual weight value according to a marked curve line and inputs the value into the main control PLC; the top lance anti-falling control program of the main control PLC performs logical operation and judgment on the acquired actual weight value according to a predetermined procedure; and if different predetermined conditions are met, the top lance anti-falling control program of the main control PLC gives an alarm or controls the motor to be started or stopped, respectively, and therefore, the problem of transmission chain breakage caused by blockage and overload in the lifting process of the top lance is solved and terrible accident of top lance falling is prevented, and abnormal damage of equipment and personal injury accidents are avoided and accident loss is reduced.
Description
Technical field
The invention belongs to automation field, relate in particular to a kind of control method be used to preventing that vacuum degassing furnace (RH stove) top rifle from falling.
Background technology
The RH-TB refining is the more advanced external refining vacuum-treat technology of present metallurgy industry, the function such as it has circulation, takes off charcoal, oxygen blast, intensification.RH furnace roof rifle transmission mechanism is the isolated plant of being responsible for top rifle lifting.Top rifle transmission mechanism is typically designed to closed linked transmission, is made of the equipment such as motor, step-down gear, sprocket wheel, chain, lift cart, encoder, oxygen rifle, connecting hose and device.
Because the dry slag phenomenon often appears in the top rifle in the production process, causes the top rifle jam phenomenon often to occur in lifting process.If jam seriously can cause the transmission system overload, cause equipment to produce improper fatigue failure after the overload, even cause transmission chain fracture, the serious accident that causes the top rifle to fall.In addition, according to the upkeep operation requirement, the top rifle need to be proposed seal section when changing the seal section packing, after changing end, need the top rifle is introduced seal section again.Because the rifle body swings, when introducing seal section, the top rifle often produces deflection, also can cause top rifle jam, can cause equally the fall generation of serious accident of rifle.
Top rifle jam causes accident seriously to restrict the normal production of RH stove, solves at present the top automatic context of detection of rifle jam how without any effective means, and it is extremely urgent therefore how to solve the automatic problem that detects of top rifle jam.
Summary of the invention
Purpose of the present invention aims to provide a kind of method that prevents that vacuum degassing furnace top rifle from falling, thereby avoids because structure deteriorate and the personal injury accident that the top rifle falls and causes.
For this reason, the solution taked of the present invention is:
A kind of method that prevents that vacuum degassing furnace top rifle from falling comprises top rifle transmission mechanism, main control PLC and connected warning howler, contactor, it is characterized in that:
In main control PLC, set up the anti-fall sequence of control of top rifle; Install a weight sensor between the back up pad of top rifle transmission mechanism and lower sprocket web plate, weight sensor is connected with main control PLC by weight transmitter;
Weight sensor sends the stressed millivolt direct current signal that converts to of lower sprocket that detects to weight transmitter by shielding cable, weight transmitter is converted into the actual weight value according to demarcating good curve with the millivolt direct current signal, and the actual weight value is inputted in the main control PLC analogue input template with 4-20mA instrument signal form;
Rifle anti-fall sequence of control in main control PLC top carries out logical operation and judgement to the actual weight value that collects according to setting program:
If during weight sensor dynamometry＜1t, the top rifle continues operation;
When: 1t≤weight sensor dynamometry＜1.5t, the top rifle continues operation, but main control PLC output switch amount signal trigger alarm device sends guard signal;
As weight sensor dynamometry 〉=1.5t, and program judges that rifle position, top is in more than the seal section, namely take standby position as 0, that the rifle position is in standby position is above 〉=and during 1350mm, main control PLC trigger alarm signal, and out of service by contactor control top rifle;
If the top rifle has entered seal section, that is: during 0≤top gun gun bit＜1350mm, main control PLC trigger alarm signal, and out of service by weight contactor control top rifle;
If top gun gun bit is below standby position, then main control PLC is raised to standby position by contactor control top rifle in the trigger alarm signal.
Described weight sensor is shear-beam type resistance-strain weight sensor.
Beneficial effect of the present invention is:
The present invention can effectively solve the top rifle in lifting process because the transmission chain breakage problem that jam and overload cause, thereby prevents the serious accident that the top rifle falls, and avoids abnormal damage and the personal injury accident of equipment, reduces causality loss.
Description of drawings
Fig. 1 is top rifle transmission mechanism synoptic diagram.
Fig. 2 is for preventing the RH furnace roof rifle Controlling System structured flowchart that falls.
Fig. 3 is for preventing the RH furnace roof rifle sequence of control schema that falls.
Among the figure: bracing frame 1, back up pad 2, upper sprocket wheel 3, lift cart 4, top rifle 5, chain 6, weight sensor 7, web plate 8, lower sprocket 9.
Embodiment
As seen from Figure 1, rifle transmission mechanism in top mainly is comprised of bracing frame 1, back up pad 2, upper sprocket wheel 3, lift cart 4, top rifle 5, chain 6, weight sensor 7, web plate 8, lower sprocket 9 and electric motor, step-down gear.Electric motor also is connected on the main control PLC by contactor except being connected with upper sprocket wheel 3 by step-down gear.
The present invention prevents the method that vacuum degassing furnace top rifle falls, and is to set up the anti-fall sequence of control of top rifle in main control PLC.And between the web plate 8 of the back up pad 2 of top rifle transmission mechanism and lower sprocket 9, installed a shear-beam type resistance-strain weight sensor 7, weight sensor 7 is connected the main control PLC analogue input template by shielding cable with weight transmitter, main control PLC output terminal one is to connect and the control electric motor by contactor; The other end connects warning howler.(see figure 2)
Concrete control process of the present invention is: weight sensor 7 converts the stress value of the lower sprocket 9 that detects to a millivolt direct current signal and sends weight transmitter to by shielding cable, weight transmitter is converted into the actual weight value according to demarcating good curve with the millivolt direct current signal, and the actual weight value is inputted in the main control PLC analogue input template with 4-20mA instrument signal form.
Rifle anti-fall sequence of control in main control PLC top carries out logical operation and judgement to the actual weight value that collects according to setting program, and by Fig. 3 sequence of control schema as seen, it is judged and control process is:
When weight sensor dynamometry＜1t, the top rifle continues operation.
When: 1t≤weight sensor dynamometry＜1.5t, the top rifle continues operation, but main control PLC output switch amount signal trigger alarm device sends guard signal.
As weight sensor dynamometry 〉=1.5t, and program judges that rifle position, top is in more than the seal section, namely take standby position as 0, that the rifle position is in standby position is above 〉=and during 1350mm, main control PLC trigger alarm signal, and out of service by contactor control top rifle.
If the top rifle has entered seal section, that is: during 0≤top gun gun bit＜1350mm, main control PLC trigger alarm signal, and out of service by weight contactor control top rifle.
If top gun gun bit is below standby position, then main control PLC is raised to standby position by contactor control top rifle in the trigger alarm signal.
Claims (2)
1. a method that prevents that vacuum degassing furnace top rifle from falling comprises top rifle transmission mechanism, main control PLC and connected warning howler, contactor, it is characterized in that:
In main control PLC, set up the anti-fall sequence of control of top rifle; Install a weight sensor between the back up pad of top rifle transmission mechanism and lower sprocket web plate, weight sensor is connected with main control PLC by weight transmitter;
Weight sensor sends the stressed millivolt direct current signal that converts to of lower sprocket that detects to weight transmitter by shielding cable, weight transmitter is converted into the actual weight value according to demarcating good curve with the millivolt direct current signal, and the actual weight value is inputted in the main control PLC analogue input template with 4-20mA instrument signal form;
Rifle anti-fall sequence of control in main control PLC top carries out logical operation and judgement to the actual weight value that collects according to setting program:
If during weight sensor dynamometry＜1t, the top rifle continues operation;
When: 1t≤weight sensor dynamometry＜1.5t, the top rifle continues operation, but main control PLC output switch amount signal trigger alarm device sends guard signal;
As weight sensor dynamometry 〉=1.5t, and program judges that rifle position, top is in more than the seal section, namely take standby position as 0, that the rifle position is in standby position is above 〉=and during 1350mm, main control PLC trigger alarm signal, and out of service by contactor control top rifle;
If the top rifle has entered seal section, that is: during 0≤top gun gun bit＜1350mm, main control PLC trigger alarm signal, and out of service by weight contactor control top rifle;
If top gun gun bit is below standby position, then main control PLC is raised to standby position by contactor control top rifle in the trigger alarm signal.
2. the method that prevents that vacuum degassing furnace top rifle from falling according to claim 1 is characterized in that, described weight sensor is shear-beam type resistance-strain weight sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210361288.6A CN102899457B (en) | 2012-09-25 | 2012-09-25 | Method for preventing top lance of vacuum cycle degassing furnace from falling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210361288.6A CN102899457B (en) | 2012-09-25 | 2012-09-25 | Method for preventing top lance of vacuum cycle degassing furnace from falling |
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| CN102899457A true CN102899457A (en) | 2013-01-30 |
| CN102899457B CN102899457B (en) | 2014-03-12 |
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| CN201210361288.6A Active CN102899457B (en) | 2012-09-25 | 2012-09-25 | Method for preventing top lance of vacuum cycle degassing furnace from falling |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201620175U (en) * | 2010-02-24 | 2010-11-03 | 南京钢铁股份有限公司 | Converter sublance cart anti-falling device |
| CN101935737A (en) * | 2010-09-07 | 2011-01-05 | 中冶华天南京自动化工程有限公司 | Device for integrally detecting height of oxygen lance height and looseness and tightness of steel wire rope of oxygen gun |
-
2012
- 2012-09-25 CN CN201210361288.6A patent/CN102899457B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201620175U (en) * | 2010-02-24 | 2010-11-03 | 南京钢铁股份有限公司 | Converter sublance cart anti-falling device |
| CN101935737A (en) * | 2010-09-07 | 2011-01-05 | 中冶华天南京自动化工程有限公司 | Device for integrally detecting height of oxygen lance height and looseness and tightness of steel wire rope of oxygen gun |
Non-Patent Citations (1)
| Title |
|---|
| 孙涛等: "钢水真空精炼顶枪的电气控制设计与实现", 《冶金动力》, no. 6, 31 December 2008 (2008-12-31) * |
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| CN102899457B (en) | 2014-03-12 |
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